Thus, the kick in the butt from WTBTS (WT, January 15, 2014, pages 22-26):
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2 Many Christians in their 50’s and older still have plenty of vigor. They may have some gray hair, but likely they do not yet have the frail health described by Solomon.
9 The apostle Peter may have been over 50 when he moved to where the need was greater.
10 Today, many Christians in their 50’s and older find that their circumstances have changed and that they are able to serve Jehovah in new ways.
14 Although many Christians in their 50’s have fine opportunities to do new things in Jehovah’s service, not all can. Some of them have poor health, and others care for aging parents or dependent children.